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10.6. Using Hibernate filters

Hibernate's most unique, useful feature is the filter. Filters provide a restricted view of the data in the database. You can find more information in the Hibernate documentation, but this section takes you through one easy, effective method of incorporating filters into Seam.
Seam-managed persistence contexts can have a list of filters defined, which will be enabled whenever an EntityManager or Hibernate Session is first created. (These can only be used when Hibernate is the underlying persistence provider.) 
<persistence:filter name="regionFilter">
  <persistence:name>region</persistence:name>
  <persistence:parameters>
    <key>regionCode</key>
    <value>#{region.code}</value>
  </persistence:parameters>
</persistence:filter>

<persistence:filter name="currentFilter">
  <persistence:name>current</persistence:name>
  <persistence:parameters>
    <key>date</key>
    <value>#{currentDate}</value>
  </persistence:parameters>
</persistence:filter>

<persistence:managed-persistence-context name="personDatabase"
  persistence-unit-jndi-name="java:/EntityManagerFactories/personDatabase">
  <persistence:filters>
    <value>#{regionFilter}</value>
    <value>#{currentFilter}</value>
  </persistence:filters>
</persistence:managed-persistence-context>
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